Smoke-consuming furnace



(No Model.)

G. GRAF.

SMOKE GONSUMING FURNACE.

No. 538,673. Patented May'7 1895.

elm a um Nrrnn STATES PATENT OFFICE.

GOTTLIEB GRAF, OF TOLEDO, OHIO.

SMOKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 538,673, dated May '7', 1895.

Application filed October 31, 1894.

I To all whom it may concern.-

Be it known that I, GOTTLIEB GRAB, a citizen of the United States, residing at Toledo, in the county of Lucas and State of Ohio, have invented certain new and. useful Improvements in Smoke-Consuming Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to improvements, as hereinafter set forth, in smoke-consuming furnaces. I

In the drawings, Figure 1 represents a longitudinal section of so much of a furnace as necessary to illustrate the construction and application of my improvements. Fig. 2 represents detail sectional views on the line 2 2 of Fig. 1.

The object of my invention is to produce a series of air supplying, receiving and conveying fiues, pipes-and chambers sectional in character and readily applied in and removed from position in furnaces of varied construction, whereby the supply of cold air may be thoroughly heated very speedily and supplied to and commingled with the smoke in its passage along the smoke flue.

1 represents the bridge-wall, 2 the gratebars, 3 the ash-pit, and 4 the rear wall, of a furnace of my construction.

5 represents the airducts, or pipes, of which there may be any desired number according to requirement, the size of the furnace or desire. This air-duct, or pipe, through which air is supplied from the outer atmosphere to the air-supply chamber or reservoir,

6, extends, as shown, from the outer atmosphere in a horizontal direction into and for a suitable distance along the ash-pit, 3, and thence upwardly, as at 7, to the air-supply or reservoir chamber, 6, which may be either formed in one piece and extend across the furnace and the length, or nearly so, of the flame and smoke due, 8, or it may be formed in two or more vertically-divided sections a, b, so as to be the more readily placed in and removed from position in the furnace. This air-reservoir or supply chamber, 6, is of rectangular shape and has formed in its upper face a series of openings, 9, through which the air from the chamber or reservoir, 6,

fierial No. 527,591. (No model.)

passes up into and through a series of airsupply tubes, 10, which at their lower ends are cast integrally with said air reservoir or chamber, so as to register with the openings, 9. These tubes, 10, extend vertically up through the flame and smoke flue or passage. 8, of the furnace and register with openings, 11, in the lower face of the warm-air distributing chamber 12, which rests upon and is supported bythe tops of said tubes, 10, as

shown, lugs or flanges, 0, being cast on the bottom of the chamber, 12, to constitute sockets to receive and hold said tubes, 10, and the chamber, 12, in position.

13 represents short tubes registering with and extending inwardly from the openings, 11, in the air-distributing chamber, 12, and formed integrally with the under wall of said chamber, 12. The air as it passes up from the cold-air receiving chamber or reservoir, 6, through the tubes, 10, becomes heated by the passage across and around said tubes 10 of the products of combustion and, passing through the short tubes, 13, discharges into the hot-air distributing chamber, 12, from whence said heated air discharges, through other openings, 14, in the bottom of the chamber, 12, into the flame and smoke flue, 8, where said heated air mingles with the products of combustion. It will be observed that the tubes, 10, through which theair passes through the smoke flue are of much smaller circumference than the cold-air inlet tube, or tubes, and that said tubes, 10, are disposed over the upper surface of the supply chamber, 6; also, that the upper chamber through which the heated air is supplied to the smoke flue has discharge openings arranged over the entire area of its bottom. By this construction and arrangement it will be evident that the heated air is supplied over the entire area of the smoke flue and, consequently, is intimately commingled with the products of combustion therein. By forming the hot-air distributing chamber, 12, sectional as shown it can be Very readily placed in and removed from position in a furnace. If desired, any suitable connection between the tops of the tubes, 10, and the under face of the chamber, 12, may be had, as, for instance, there may be flanges formed on the tops of the tubes, 10,

and screws may be passed through such flanges into the bottom of said chamber, 12, but it will be found, in practice, that such connection will be unnecessary as said chamber will securely rest upon and be supported by the tops of the tubes, 10, which, as said tubes, 10, are arranged at each end and also at the center, will steadily support said chamber, 12.

By making the respective air chamber of sectional form, and constructing the air-supply tubes separately from said air chambers, it will readily be seen that should any portion of the apparatus become worn or injured it can readily be replaced without necessitating the renewal of any other part.

By forming the tubes, 10, of small circumference, the air from the cold air chamber, 6, travels slowly up through the smoke fine and thereby becomes very thoroughly heated before it reaches the distributing chamber, 12. By forming discharge openings, 14, over the entire surface of the bottom of the chamber, 12, I am enabled to furnish a supply of hot air to the products of combustion in the smoke flue equaling a four-inch discharge, or supply, of hot air to each square foot of smoke flue, thereby producing perfect combustion, and attaining a saving of fifteen per cent. of the fuel consumed. Apparatus constructed in accordance with this invention has been found to operate successfully in both warm and in cold weather, and to secure the perfect combustion of smoke from the commencement of the use of the furnace.

Having thus described my invention, What I claim is-= In a boiler furnace, the combination of an air inlet, a reservoir chamberconnected therewith and having discharge openings in its upper face, said chamber being arranged in the smoke fine and rearwardly of the bridge- Wall, a series of vertical tubes of small circumference connected with the discharge openings in said chamber and extending vertically through the smoke flue, a warm-air receiving-chamber supported upon the tops of said tubes and having air-receiving openings in its bottom registering with said air conveying tubes and inwardly extending tubes registering with said openings and a series of discharge openings in its bottom, substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of witnesses.

GOTTLIEB GRAF.

Witnesses:

N10 WAGNER,

AMOS S. TROUT, ANNA I-I. TROUT. 

